ASTM D6327-1998(2004) Standard Test Method for Determination of Radon Decay Product Concentration and Working Level in Indoor Atmospheres by Active Sampling on a Filter《通过滤膜上活动取样对室.pdf
《ASTM D6327-1998(2004) Standard Test Method for Determination of Radon Decay Product Concentration and Working Level in Indoor Atmospheres by Active Sampling on a Filter《通过滤膜上活动取样对室.pdf》由会员分享,可在线阅读,更多相关《ASTM D6327-1998(2004) Standard Test Method for Determination of Radon Decay Product Concentration and Working Level in Indoor Atmospheres by Active Sampling on a Filter《通过滤膜上活动取样对室.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 6327 98 (Reapproved 2004)Standard Test Method forDetermination of Radon Decay Product Concentration andWorking Level in Indoor Atmospheres by Active Samplingon a Filter1This standard is issued under the fixed designation D 6327; the number immediately following the designation indicat
2、es the year oforiginal adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method provides instruction for us
3、ing the grabsampling filter technique to determine accurate and reproduc-ible measurements of indoor radon decay product (RDP)concentrations and of the working level value corresponding tothose concentrations.1.2 Measurements made in accordance with this test methodwill produce RDP concentrations re
4、presentative of closed-building conditions. Results of measurements made underclosed-building conditions will have a smaller variability andare more reproducible than measurements obtained whenbuilding conditions are not controlled. This test method may beutilized under non-controlled conditions, bu
5、t a greater degreeof variability in the results will occur. Variability in the resultsmay also be an indication of temporal variability present at thesampling site.1.3 This test method utilizes a short sampling period and theresults are indicative of the conditions only at the place andtime of sampl
6、ing. The results obtained by this test method arenot necessarily indicative of longer terms of sampling andshould not be confused with such results. The averaging ofmultiple measurements over hours and days can, however,provide useful screening information. Individual measure-ments are generally obt
7、ained for diagnostic purposes.1.4 The range of the test method may be considered from0.0005 WL to unlimited working levels (WL), and from 40Bq/m3 to unlimited for each individual randon decay product.1.5 This test method provides information on equipment,procedures, and quality control. It provides
8、for measurementswithin typical residential or building environments and maynot necessarily apply to specialized circumstances, for ex-ample, clean rooms.1.6 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of th
9、is standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use. See Section 9 foradditional precautions.2. Referenced Documents2.1 ASTM Standards:2D 1356 Terminology Relating to Sampling and Analysis ofAtmospheresD 1605 Pract
10、ices for SamplingAtmospheres forAnalysis ofGases and VaporsD 3631 Test Methods for Measuring Surface AtmosphericPressureE1 Specification for ASTM Thermometers3. Terminology3.1 Definitions For definitions of terms used in this testmethod, refer to Terminology D 1356.3.2 Definitions of Terms Specific
11、to This Standard:3.2.1 radonthe particular isotope Radon-222.3.2.2 radon decay products (RDP)any or all of theparticular isotopes polonium-218, bismuth-214, lead-214, andpolonium-214.3.2.3 grab samplingthe act and all procedures involvedwith obtaining a short term sample through the use of anoperati
12、ng air pump.3.2.4 working levelquantity of short-lived decay productsthat will result in 1.3 3 106MeV of potential alpha energy perliter of air. The working level is the common unit forexpressing environmental RDP exposure.4. Summary of Test Method34.1 Grab sampling measurements of RDP concentration
13、s inair are performed by collecting the RDP from a known volumeof air on a filter and subsequently counting the activity on thefilter following collection. The counting is performed atspecified times for specified periods. The energy from radio-active decay of the particles collected on the filter i
14、s converted1This test method is under the jurisdiction of ASTM Committee D22 on AirQuality and is the direct responsibility of Subcommittee D22.05 on Indoor Air.Current edition approved February 1, 2004. Published March 2004. Originallyapproved in 1998. Last previous edition approved in 1998 as D 63
15、27 - 98.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.3Thomas, J.W. “Measurement of Radon Daughters in Air,
16、” Health Physics, Vol23, 1972, p. 783.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.to light pulses by a zinc sulfide phosphor in contact with thefilter. The light pulses are detected and converted to counts.Analysis of the number
17、of counts in each counting intervaldetermines the concentrations of the RDP. The two countingmethods which have found the most general use are theKusnetz and the modified Tsivoglou procedures.45. Significance and Use5.1 The test method provides a relatively simple method fordetermination of the conc
18、entration of RDP without the need forspecialty equipment built expressly for such purposes.5.2 Using this test method will afford investigators of radonin dwellings a technique by which the RDP can be determined.The use of the results of this test method are generally fordiagnostic purposes and are
19、not necessarily indicative of resultsthat might be obtained by longer term measurement methods.5.3 An improved understanding of the frequency of elevatedradon in buildings and the health effect of exposure hasincreased the importance of knowledge of actual exposures.The measurement of RDP, which are
20、 the direct cause ofpotential adverse health effects, should be conducted in amanner that is uniform and reproducible; it is to this end thatthis test method is addressed.6. Interferences6.1 Interferences may be caused by any alpha-emittingparticle capable of inducing a light pulse in the phosphorsc
21、reen used for alpha-counting. In general, the only significantinterference source is that of the decay products of radon-220,thoron, which may be considerable in certain geographicalregions. The direction of the interference is always positive.The extent to which thoron decay products interfere can
22、beestimated or measured through alpha-spectroscopy or serialtype measurements.56.2 Some depth penetration to the filter may occur. Theextent of the penetration may be estimated using membranefilter types not suggested within this test method. The directionof interferences is always negative.7. Appar
23、atus7.1 Collection Apparatus:7.1.1 Air pump capable of 10 to 12 L/min flow rate.7.1.2 Bubble tube airflow calibration cell, 1 L or larger.7.1.3 Calibrated dry gas meter.7.1.4 Flow meter (optional).7.1.5 Open-faced filter holder, 25 or 47-mm diameter.7.1.6 Membrane filters, mixed cellulose ester, 25
24、or 47-mmdiameter, 0.8-m pore size.7.1.7 Sharpened forceps, for removal of sample filters.7.1.8 Stopwatch, accurate to 1 s.7.2 Decay Counting Apparatus:7.2.1 Zinc sulfide phosphor discs, 51-mm diameter.7.2.2 Scintillation Counter, scaler and photomultiplier tube.7.2.3 High voltage power supply.7.3 Th
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTMD632719982004STANDARDTESTMETHODFORDETERMINATIONOFRADONDECAYPRODUCTCONCENTRATIONANDWORKINGLEVELININDOORATMOSPHERESBYACTIVESAMPLINGONAFILTER

链接地址:http://www.mydoc123.com/p-522178.html